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1/*
2 * Copyright (c) 2007-2014 Nicira, Inc.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16 * 02110-1301, USA
17 */
18
19#include <linux/etherdevice.h>
20#include <linux/if.h>
21#include <linux/if_vlan.h>
22#include <linux/jhash.h>
23#include <linux/kernel.h>
24#include <linux/list.h>
25#include <linux/mutex.h>
26#include <linux/percpu.h>
27#include <linux/rcupdate.h>
28#include <linux/rtnetlink.h>
29#include <linux/compat.h>
30#include <net/net_namespace.h>
31#include <linux/module.h>
32
33#include "datapath.h"
34#include "vport.h"
35#include "vport-internal_dev.h"
36
37static LIST_HEAD(vport_ops_list);
38
39/* Protected by RCU read lock for reading, ovs_mutex for writing. */
40static struct hlist_head *dev_table;
41#define VPORT_HASH_BUCKETS 1024
42
43/**
44 * ovs_vport_init - initialize vport subsystem
45 *
46 * Called at module load time to initialize the vport subsystem.
47 */
48int ovs_vport_init(void)
49{
50 dev_table = kzalloc(VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
51 GFP_KERNEL);
52 if (!dev_table)
53 return -ENOMEM;
54
55 return 0;
56}
57
58/**
59 * ovs_vport_exit - shutdown vport subsystem
60 *
61 * Called at module exit time to shutdown the vport subsystem.
62 */
63void ovs_vport_exit(void)
64{
65 kfree(dev_table);
66}
67
68static struct hlist_head *hash_bucket(const struct net *net, const char *name)
69{
70 unsigned int hash = jhash(name, strlen(name), (unsigned long) net);
71 return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)];
72}
73
74int __ovs_vport_ops_register(struct vport_ops *ops)
75{
76 int err = -EEXIST;
77 struct vport_ops *o;
78
79 ovs_lock();
80 list_for_each_entry(o, &vport_ops_list, list)
81 if (ops->type == o->type)
82 goto errout;
83
84 list_add_tail(&ops->list, &vport_ops_list);
85 err = 0;
86errout:
87 ovs_unlock();
88 return err;
89}
90EXPORT_SYMBOL_GPL(__ovs_vport_ops_register);
91
92void ovs_vport_ops_unregister(struct vport_ops *ops)
93{
94 ovs_lock();
95 list_del(&ops->list);
96 ovs_unlock();
97}
98EXPORT_SYMBOL_GPL(ovs_vport_ops_unregister);
99
100/**
101 * ovs_vport_locate - find a port that has already been created
102 *
103 * @name: name of port to find
104 *
105 * Must be called with ovs or RCU read lock.
106 */
107struct vport *ovs_vport_locate(const struct net *net, const char *name)
108{
109 struct hlist_head *bucket = hash_bucket(net, name);
110 struct vport *vport;
111
112 hlist_for_each_entry_rcu(vport, bucket, hash_node)
113 if (!strcmp(name, ovs_vport_name(vport)) &&
114 net_eq(ovs_dp_get_net(vport->dp), net))
115 return vport;
116
117 return NULL;
118}
119
120/**
121 * ovs_vport_alloc - allocate and initialize new vport
122 *
123 * @priv_size: Size of private data area to allocate.
124 * @ops: vport device ops
125 *
126 * Allocate and initialize a new vport defined by @ops. The vport will contain
127 * a private data area of size @priv_size that can be accessed using
128 * vport_priv(). vports that are no longer needed should be released with
129 * vport_free().
130 */
131struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops,
132 const struct vport_parms *parms)
133{
134 struct vport *vport;
135 size_t alloc_size;
136
137 alloc_size = sizeof(struct vport);
138 if (priv_size) {
139 alloc_size = ALIGN(alloc_size, VPORT_ALIGN);
140 alloc_size += priv_size;
141 }
142
143 vport = kzalloc(alloc_size, GFP_KERNEL);
144 if (!vport)
145 return ERR_PTR(-ENOMEM);
146
147 vport->dp = parms->dp;
148 vport->port_no = parms->port_no;
149 vport->ops = ops;
150 INIT_HLIST_NODE(&vport->dp_hash_node);
151
152 if (ovs_vport_set_upcall_portids(vport, parms->upcall_portids)) {
153 kfree(vport);
154 return ERR_PTR(-EINVAL);
155 }
156
157 return vport;
158}
159EXPORT_SYMBOL_GPL(ovs_vport_alloc);
160
161/**
162 * ovs_vport_free - uninitialize and free vport
163 *
164 * @vport: vport to free
165 *
166 * Frees a vport allocated with vport_alloc() when it is no longer needed.
167 *
168 * The caller must ensure that an RCU grace period has passed since the last
169 * time @vport was in a datapath.
170 */
171void ovs_vport_free(struct vport *vport)
172{
173 /* vport is freed from RCU callback or error path, Therefore
174 * it is safe to use raw dereference.
175 */
176 kfree(rcu_dereference_raw(vport->upcall_portids));
177 kfree(vport);
178}
179EXPORT_SYMBOL_GPL(ovs_vport_free);
180
181static struct vport_ops *ovs_vport_lookup(const struct vport_parms *parms)
182{
183 struct vport_ops *ops;
184
185 list_for_each_entry(ops, &vport_ops_list, list)
186 if (ops->type == parms->type)
187 return ops;
188
189 return NULL;
190}
191
192/**
193 * ovs_vport_add - add vport device (for kernel callers)
194 *
195 * @parms: Information about new vport.
196 *
197 * Creates a new vport with the specified configuration (which is dependent on
198 * device type). ovs_mutex must be held.
199 */
200struct vport *ovs_vport_add(const struct vport_parms *parms)
201{
202 struct vport_ops *ops;
203 struct vport *vport;
204
205 ops = ovs_vport_lookup(parms);
206 if (ops) {
207 struct hlist_head *bucket;
208
209 if (!try_module_get(ops->owner))
210 return ERR_PTR(-EAFNOSUPPORT);
211
212 vport = ops->create(parms);
213 if (IS_ERR(vport)) {
214 module_put(ops->owner);
215 return vport;
216 }
217
218 bucket = hash_bucket(ovs_dp_get_net(vport->dp),
219 ovs_vport_name(vport));
220 hlist_add_head_rcu(&vport->hash_node, bucket);
221 return vport;
222 }
223
224 /* Unlock to attempt module load and return -EAGAIN if load
225 * was successful as we need to restart the port addition
226 * workflow.
227 */
228 ovs_unlock();
229 request_module("vport-type-%d", parms->type);
230 ovs_lock();
231
232 if (!ovs_vport_lookup(parms))
233 return ERR_PTR(-EAFNOSUPPORT);
234 else
235 return ERR_PTR(-EAGAIN);
236}
237
238/**
239 * ovs_vport_set_options - modify existing vport device (for kernel callers)
240 *
241 * @vport: vport to modify.
242 * @options: New configuration.
243 *
244 * Modifies an existing device with the specified configuration (which is
245 * dependent on device type). ovs_mutex must be held.
246 */
247int ovs_vport_set_options(struct vport *vport, struct nlattr *options)
248{
249 if (!vport->ops->set_options)
250 return -EOPNOTSUPP;
251 return vport->ops->set_options(vport, options);
252}
253
254/**
255 * ovs_vport_del - delete existing vport device
256 *
257 * @vport: vport to delete.
258 *
259 * Detaches @vport from its datapath and destroys it. ovs_mutex must
260 * be held.
261 */
262void ovs_vport_del(struct vport *vport)
263{
264 ASSERT_OVSL();
265
266 hlist_del_rcu(&vport->hash_node);
267 module_put(vport->ops->owner);
268 vport->ops->destroy(vport);
269}
270
271/**
272 * ovs_vport_get_stats - retrieve device stats
273 *
274 * @vport: vport from which to retrieve the stats
275 * @stats: location to store stats
276 *
277 * Retrieves transmit, receive, and error stats for the given device.
278 *
279 * Must be called with ovs_mutex or rcu_read_lock.
280 */
281void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats)
282{
283 const struct rtnl_link_stats64 *dev_stats;
284 struct rtnl_link_stats64 temp;
285
286 dev_stats = dev_get_stats(vport->dev, &temp);
287 stats->rx_errors = dev_stats->rx_errors;
288 stats->tx_errors = dev_stats->tx_errors;
289 stats->tx_dropped = dev_stats->tx_dropped;
290 stats->rx_dropped = dev_stats->rx_dropped;
291
292 stats->rx_bytes = dev_stats->rx_bytes;
293 stats->rx_packets = dev_stats->rx_packets;
294 stats->tx_bytes = dev_stats->tx_bytes;
295 stats->tx_packets = dev_stats->tx_packets;
296}
297
298/**
299 * ovs_vport_get_options - retrieve device options
300 *
301 * @vport: vport from which to retrieve the options.
302 * @skb: sk_buff where options should be appended.
303 *
304 * Retrieves the configuration of the given device, appending an
305 * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested
306 * vport-specific attributes to @skb.
307 *
308 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another
309 * negative error code if a real error occurred. If an error occurs, @skb is
310 * left unmodified.
311 *
312 * Must be called with ovs_mutex or rcu_read_lock.
313 */
314int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb)
315{
316 struct nlattr *nla;
317 int err;
318
319 if (!vport->ops->get_options)
320 return 0;
321
322 nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS);
323 if (!nla)
324 return -EMSGSIZE;
325
326 err = vport->ops->get_options(vport, skb);
327 if (err) {
328 nla_nest_cancel(skb, nla);
329 return err;
330 }
331
332 nla_nest_end(skb, nla);
333 return 0;
334}
335
336/**
337 * ovs_vport_set_upcall_portids - set upcall portids of @vport.
338 *
339 * @vport: vport to modify.
340 * @ids: new configuration, an array of port ids.
341 *
342 * Sets the vport's upcall_portids to @ids.
343 *
344 * Returns 0 if successful, -EINVAL if @ids is zero length or cannot be parsed
345 * as an array of U32.
346 *
347 * Must be called with ovs_mutex.
348 */
349int ovs_vport_set_upcall_portids(struct vport *vport, const struct nlattr *ids)
350{
351 struct vport_portids *old, *vport_portids;
352
353 if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
354 return -EINVAL;
355
356 old = ovsl_dereference(vport->upcall_portids);
357
358 vport_portids = kmalloc(sizeof(*vport_portids) + nla_len(ids),
359 GFP_KERNEL);
360 if (!vport_portids)
361 return -ENOMEM;
362
363 vport_portids->n_ids = nla_len(ids) / sizeof(u32);
364 vport_portids->rn_ids = reciprocal_value(vport_portids->n_ids);
365 nla_memcpy(vport_portids->ids, ids, nla_len(ids));
366
367 rcu_assign_pointer(vport->upcall_portids, vport_portids);
368
369 if (old)
370 kfree_rcu(old, rcu);
371 return 0;
372}
373
374/**
375 * ovs_vport_get_upcall_portids - get the upcall_portids of @vport.
376 *
377 * @vport: vport from which to retrieve the portids.
378 * @skb: sk_buff where portids should be appended.
379 *
380 * Retrieves the configuration of the given vport, appending the
381 * %OVS_VPORT_ATTR_UPCALL_PID attribute which is the array of upcall
382 * portids to @skb.
383 *
384 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room.
385 * If an error occurs, @skb is left unmodified. Must be called with
386 * ovs_mutex or rcu_read_lock.
387 */
388int ovs_vport_get_upcall_portids(const struct vport *vport,
389 struct sk_buff *skb)
390{
391 struct vport_portids *ids;
392
393 ids = rcu_dereference_ovsl(vport->upcall_portids);
394
395 if (vport->dp->user_features & OVS_DP_F_VPORT_PIDS)
396 return nla_put(skb, OVS_VPORT_ATTR_UPCALL_PID,
397 ids->n_ids * sizeof(u32), (void *)ids->ids);
398 else
399 return nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, ids->ids[0]);
400}
401
402/**
403 * ovs_vport_find_upcall_portid - find the upcall portid to send upcall.
404 *
405 * @vport: vport from which the missed packet is received.
406 * @skb: skb that the missed packet was received.
407 *
408 * Uses the skb_get_hash() to select the upcall portid to send the
409 * upcall.
410 *
411 * Returns the portid of the target socket. Must be called with rcu_read_lock.
412 */
413u32 ovs_vport_find_upcall_portid(const struct vport *vport, struct sk_buff *skb)
414{
415 struct vport_portids *ids;
416 u32 ids_index;
417 u32 hash;
418
419 ids = rcu_dereference(vport->upcall_portids);
420
421 if (ids->n_ids == 1 && ids->ids[0] == 0)
422 return 0;
423
424 hash = skb_get_hash(skb);
425 ids_index = hash - ids->n_ids * reciprocal_divide(hash, ids->rn_ids);
426 return ids->ids[ids_index];
427}
428
429/**
430 * ovs_vport_receive - pass up received packet to the datapath for processing
431 *
432 * @vport: vport that received the packet
433 * @skb: skb that was received
434 * @tun_key: tunnel (if any) that carried packet
435 *
436 * Must be called with rcu_read_lock. The packet cannot be shared and
437 * skb->data should point to the Ethernet header.
438 */
439int ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
440 const struct ip_tunnel_info *tun_info)
441{
442 struct sw_flow_key key;
443 int error;
444
445 OVS_CB(skb)->input_vport = vport;
446 OVS_CB(skb)->mru = 0;
447 OVS_CB(skb)->cutlen = 0;
448 if (unlikely(dev_net(skb->dev) != ovs_dp_get_net(vport->dp))) {
449 u32 mark;
450
451 mark = skb->mark;
452 skb_scrub_packet(skb, true);
453 skb->mark = mark;
454 tun_info = NULL;
455 }
456
457 /* Extract flow from 'skb' into 'key'. */
458 error = ovs_flow_key_extract(tun_info, skb, &key);
459 if (unlikely(error)) {
460 kfree_skb(skb);
461 return error;
462 }
463 ovs_dp_process_packet(skb, &key);
464 return 0;
465}
466
467static unsigned int packet_length(const struct sk_buff *skb,
468 struct net_device *dev)
469{
470 unsigned int length = skb->len - dev->hard_header_len;
471
472 if (!skb_vlan_tag_present(skb) &&
473 eth_type_vlan(skb->protocol))
474 length -= VLAN_HLEN;
475
476 /* Don't subtract for multiple VLAN tags. Most (all?) drivers allow
477 * (ETH_LEN + VLAN_HLEN) in addition to the mtu value, but almost none
478 * account for 802.1ad. e.g. is_skb_forwardable().
479 */
480
481 return length;
482}
483
484void ovs_vport_send(struct vport *vport, struct sk_buff *skb, u8 mac_proto)
485{
486 int mtu = vport->dev->mtu;
487
488 switch (vport->dev->type) {
489 case ARPHRD_NONE:
490 if (mac_proto == MAC_PROTO_ETHERNET) {
491 skb_reset_network_header(skb);
492 skb_reset_mac_len(skb);
493 skb->protocol = htons(ETH_P_TEB);
494 } else if (mac_proto != MAC_PROTO_NONE) {
495 WARN_ON_ONCE(1);
496 goto drop;
497 }
498 break;
499 case ARPHRD_ETHER:
500 if (mac_proto != MAC_PROTO_ETHERNET)
501 goto drop;
502 break;
503 default:
504 goto drop;
505 }
506
507 if (unlikely(packet_length(skb, vport->dev) > mtu &&
508 !skb_is_gso(skb))) {
509 net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
510 vport->dev->name,
511 packet_length(skb, vport->dev), mtu);
512 vport->dev->stats.tx_errors++;
513 goto drop;
514 }
515
516 skb->dev = vport->dev;
517 vport->ops->send(skb);
518 return;
519
520drop:
521 kfree_skb(skb);
522}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2007-2014 Nicira, Inc.
4 */
5
6#include <linux/etherdevice.h>
7#include <linux/if.h>
8#include <linux/if_vlan.h>
9#include <linux/jhash.h>
10#include <linux/kernel.h>
11#include <linux/list.h>
12#include <linux/mutex.h>
13#include <linux/percpu.h>
14#include <linux/rcupdate.h>
15#include <linux/rtnetlink.h>
16#include <linux/compat.h>
17#include <net/net_namespace.h>
18#include <linux/module.h>
19
20#include "datapath.h"
21#include "vport.h"
22#include "vport-internal_dev.h"
23
24static LIST_HEAD(vport_ops_list);
25
26/* Protected by RCU read lock for reading, ovs_mutex for writing. */
27static struct hlist_head *dev_table;
28#define VPORT_HASH_BUCKETS 1024
29
30/**
31 * ovs_vport_init - initialize vport subsystem
32 *
33 * Called at module load time to initialize the vport subsystem.
34 */
35int ovs_vport_init(void)
36{
37 dev_table = kcalloc(VPORT_HASH_BUCKETS, sizeof(struct hlist_head),
38 GFP_KERNEL);
39 if (!dev_table)
40 return -ENOMEM;
41
42 return 0;
43}
44
45/**
46 * ovs_vport_exit - shutdown vport subsystem
47 *
48 * Called at module exit time to shutdown the vport subsystem.
49 */
50void ovs_vport_exit(void)
51{
52 kfree(dev_table);
53}
54
55static struct hlist_head *hash_bucket(const struct net *net, const char *name)
56{
57 unsigned int hash = jhash(name, strlen(name), (unsigned long) net);
58 return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)];
59}
60
61int __ovs_vport_ops_register(struct vport_ops *ops)
62{
63 int err = -EEXIST;
64 struct vport_ops *o;
65
66 ovs_lock();
67 list_for_each_entry(o, &vport_ops_list, list)
68 if (ops->type == o->type)
69 goto errout;
70
71 list_add_tail(&ops->list, &vport_ops_list);
72 err = 0;
73errout:
74 ovs_unlock();
75 return err;
76}
77EXPORT_SYMBOL_GPL(__ovs_vport_ops_register);
78
79void ovs_vport_ops_unregister(struct vport_ops *ops)
80{
81 ovs_lock();
82 list_del(&ops->list);
83 ovs_unlock();
84}
85EXPORT_SYMBOL_GPL(ovs_vport_ops_unregister);
86
87/**
88 * ovs_vport_locate - find a port that has already been created
89 *
90 * @net: network namespace
91 * @name: name of port to find
92 *
93 * Must be called with ovs or RCU read lock.
94 */
95struct vport *ovs_vport_locate(const struct net *net, const char *name)
96{
97 struct hlist_head *bucket = hash_bucket(net, name);
98 struct vport *vport;
99
100 hlist_for_each_entry_rcu(vport, bucket, hash_node,
101 lockdep_ovsl_is_held())
102 if (!strcmp(name, ovs_vport_name(vport)) &&
103 net_eq(ovs_dp_get_net(vport->dp), net))
104 return vport;
105
106 return NULL;
107}
108
109/**
110 * ovs_vport_alloc - allocate and initialize new vport
111 *
112 * @priv_size: Size of private data area to allocate.
113 * @ops: vport device ops
114 *
115 * Allocate and initialize a new vport defined by @ops. The vport will contain
116 * a private data area of size @priv_size that can be accessed using
117 * vport_priv(). vports that are no longer needed should be released with
118 * vport_free().
119 */
120struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops,
121 const struct vport_parms *parms)
122{
123 struct vport *vport;
124 size_t alloc_size;
125
126 alloc_size = sizeof(struct vport);
127 if (priv_size) {
128 alloc_size = ALIGN(alloc_size, VPORT_ALIGN);
129 alloc_size += priv_size;
130 }
131
132 vport = kzalloc(alloc_size, GFP_KERNEL);
133 if (!vport)
134 return ERR_PTR(-ENOMEM);
135
136 vport->dp = parms->dp;
137 vport->port_no = parms->port_no;
138 vport->ops = ops;
139 INIT_HLIST_NODE(&vport->dp_hash_node);
140
141 if (ovs_vport_set_upcall_portids(vport, parms->upcall_portids)) {
142 kfree(vport);
143 return ERR_PTR(-EINVAL);
144 }
145
146 return vport;
147}
148EXPORT_SYMBOL_GPL(ovs_vport_alloc);
149
150/**
151 * ovs_vport_free - uninitialize and free vport
152 *
153 * @vport: vport to free
154 *
155 * Frees a vport allocated with vport_alloc() when it is no longer needed.
156 *
157 * The caller must ensure that an RCU grace period has passed since the last
158 * time @vport was in a datapath.
159 */
160void ovs_vport_free(struct vport *vport)
161{
162 /* vport is freed from RCU callback or error path, Therefore
163 * it is safe to use raw dereference.
164 */
165 kfree(rcu_dereference_raw(vport->upcall_portids));
166 kfree(vport);
167}
168EXPORT_SYMBOL_GPL(ovs_vport_free);
169
170static struct vport_ops *ovs_vport_lookup(const struct vport_parms *parms)
171{
172 struct vport_ops *ops;
173
174 list_for_each_entry(ops, &vport_ops_list, list)
175 if (ops->type == parms->type)
176 return ops;
177
178 return NULL;
179}
180
181/**
182 * ovs_vport_add - add vport device (for kernel callers)
183 *
184 * @parms: Information about new vport.
185 *
186 * Creates a new vport with the specified configuration (which is dependent on
187 * device type). ovs_mutex must be held.
188 */
189struct vport *ovs_vport_add(const struct vport_parms *parms)
190{
191 struct vport_ops *ops;
192 struct vport *vport;
193
194 ops = ovs_vport_lookup(parms);
195 if (ops) {
196 struct hlist_head *bucket;
197
198 if (!try_module_get(ops->owner))
199 return ERR_PTR(-EAFNOSUPPORT);
200
201 vport = ops->create(parms);
202 if (IS_ERR(vport)) {
203 module_put(ops->owner);
204 return vport;
205 }
206
207 bucket = hash_bucket(ovs_dp_get_net(vport->dp),
208 ovs_vport_name(vport));
209 hlist_add_head_rcu(&vport->hash_node, bucket);
210 return vport;
211 }
212
213 /* Unlock to attempt module load and return -EAGAIN if load
214 * was successful as we need to restart the port addition
215 * workflow.
216 */
217 ovs_unlock();
218 request_module("vport-type-%d", parms->type);
219 ovs_lock();
220
221 if (!ovs_vport_lookup(parms))
222 return ERR_PTR(-EAFNOSUPPORT);
223 else
224 return ERR_PTR(-EAGAIN);
225}
226
227/**
228 * ovs_vport_set_options - modify existing vport device (for kernel callers)
229 *
230 * @vport: vport to modify.
231 * @options: New configuration.
232 *
233 * Modifies an existing device with the specified configuration (which is
234 * dependent on device type). ovs_mutex must be held.
235 */
236int ovs_vport_set_options(struct vport *vport, struct nlattr *options)
237{
238 if (!vport->ops->set_options)
239 return -EOPNOTSUPP;
240 return vport->ops->set_options(vport, options);
241}
242
243/**
244 * ovs_vport_del - delete existing vport device
245 *
246 * @vport: vport to delete.
247 *
248 * Detaches @vport from its datapath and destroys it. ovs_mutex must
249 * be held.
250 */
251void ovs_vport_del(struct vport *vport)
252{
253 hlist_del_rcu(&vport->hash_node);
254 module_put(vport->ops->owner);
255 vport->ops->destroy(vport);
256}
257
258/**
259 * ovs_vport_get_stats - retrieve device stats
260 *
261 * @vport: vport from which to retrieve the stats
262 * @stats: location to store stats
263 *
264 * Retrieves transmit, receive, and error stats for the given device.
265 *
266 * Must be called with ovs_mutex or rcu_read_lock.
267 */
268void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats)
269{
270 const struct rtnl_link_stats64 *dev_stats;
271 struct rtnl_link_stats64 temp;
272
273 dev_stats = dev_get_stats(vport->dev, &temp);
274 stats->rx_errors = dev_stats->rx_errors;
275 stats->tx_errors = dev_stats->tx_errors;
276 stats->tx_dropped = dev_stats->tx_dropped;
277 stats->rx_dropped = dev_stats->rx_dropped;
278
279 stats->rx_bytes = dev_stats->rx_bytes;
280 stats->rx_packets = dev_stats->rx_packets;
281 stats->tx_bytes = dev_stats->tx_bytes;
282 stats->tx_packets = dev_stats->tx_packets;
283}
284
285/**
286 * ovs_vport_get_options - retrieve device options
287 *
288 * @vport: vport from which to retrieve the options.
289 * @skb: sk_buff where options should be appended.
290 *
291 * Retrieves the configuration of the given device, appending an
292 * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested
293 * vport-specific attributes to @skb.
294 *
295 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another
296 * negative error code if a real error occurred. If an error occurs, @skb is
297 * left unmodified.
298 *
299 * Must be called with ovs_mutex or rcu_read_lock.
300 */
301int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb)
302{
303 struct nlattr *nla;
304 int err;
305
306 if (!vport->ops->get_options)
307 return 0;
308
309 nla = nla_nest_start_noflag(skb, OVS_VPORT_ATTR_OPTIONS);
310 if (!nla)
311 return -EMSGSIZE;
312
313 err = vport->ops->get_options(vport, skb);
314 if (err) {
315 nla_nest_cancel(skb, nla);
316 return err;
317 }
318
319 nla_nest_end(skb, nla);
320 return 0;
321}
322
323/**
324 * ovs_vport_set_upcall_portids - set upcall portids of @vport.
325 *
326 * @vport: vport to modify.
327 * @ids: new configuration, an array of port ids.
328 *
329 * Sets the vport's upcall_portids to @ids.
330 *
331 * Returns 0 if successful, -EINVAL if @ids is zero length or cannot be parsed
332 * as an array of U32.
333 *
334 * Must be called with ovs_mutex.
335 */
336int ovs_vport_set_upcall_portids(struct vport *vport, const struct nlattr *ids)
337{
338 struct vport_portids *old, *vport_portids;
339
340 if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
341 return -EINVAL;
342
343 old = ovsl_dereference(vport->upcall_portids);
344
345 vport_portids = kmalloc(sizeof(*vport_portids) + nla_len(ids),
346 GFP_KERNEL);
347 if (!vport_portids)
348 return -ENOMEM;
349
350 vport_portids->n_ids = nla_len(ids) / sizeof(u32);
351 vport_portids->rn_ids = reciprocal_value(vport_portids->n_ids);
352 nla_memcpy(vport_portids->ids, ids, nla_len(ids));
353
354 rcu_assign_pointer(vport->upcall_portids, vport_portids);
355
356 if (old)
357 kfree_rcu(old, rcu);
358 return 0;
359}
360
361/**
362 * ovs_vport_get_upcall_portids - get the upcall_portids of @vport.
363 *
364 * @vport: vport from which to retrieve the portids.
365 * @skb: sk_buff where portids should be appended.
366 *
367 * Retrieves the configuration of the given vport, appending the
368 * %OVS_VPORT_ATTR_UPCALL_PID attribute which is the array of upcall
369 * portids to @skb.
370 *
371 * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room.
372 * If an error occurs, @skb is left unmodified. Must be called with
373 * ovs_mutex or rcu_read_lock.
374 */
375int ovs_vport_get_upcall_portids(const struct vport *vport,
376 struct sk_buff *skb)
377{
378 struct vport_portids *ids;
379
380 ids = rcu_dereference_ovsl(vport->upcall_portids);
381
382 if (vport->dp->user_features & OVS_DP_F_VPORT_PIDS)
383 return nla_put(skb, OVS_VPORT_ATTR_UPCALL_PID,
384 ids->n_ids * sizeof(u32), (void *)ids->ids);
385 else
386 return nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, ids->ids[0]);
387}
388
389/**
390 * ovs_vport_find_upcall_portid - find the upcall portid to send upcall.
391 *
392 * @vport: vport from which the missed packet is received.
393 * @skb: skb that the missed packet was received.
394 *
395 * Uses the skb_get_hash() to select the upcall portid to send the
396 * upcall.
397 *
398 * Returns the portid of the target socket. Must be called with rcu_read_lock.
399 */
400u32 ovs_vport_find_upcall_portid(const struct vport *vport, struct sk_buff *skb)
401{
402 struct vport_portids *ids;
403 u32 ids_index;
404 u32 hash;
405
406 ids = rcu_dereference(vport->upcall_portids);
407
408 /* If there is only one portid, select it in the fast-path. */
409 if (ids->n_ids == 1)
410 return ids->ids[0];
411
412 hash = skb_get_hash(skb);
413 ids_index = hash - ids->n_ids * reciprocal_divide(hash, ids->rn_ids);
414 return ids->ids[ids_index];
415}
416
417/**
418 * ovs_vport_receive - pass up received packet to the datapath for processing
419 *
420 * @vport: vport that received the packet
421 * @skb: skb that was received
422 * @tun_info: tunnel (if any) that carried packet
423 *
424 * Must be called with rcu_read_lock. The packet cannot be shared and
425 * skb->data should point to the Ethernet header.
426 */
427int ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
428 const struct ip_tunnel_info *tun_info)
429{
430 struct sw_flow_key key;
431 int error;
432
433 OVS_CB(skb)->input_vport = vport;
434 OVS_CB(skb)->mru = 0;
435 OVS_CB(skb)->cutlen = 0;
436 if (unlikely(dev_net(skb->dev) != ovs_dp_get_net(vport->dp))) {
437 u32 mark;
438
439 mark = skb->mark;
440 skb_scrub_packet(skb, true);
441 skb->mark = mark;
442 tun_info = NULL;
443 }
444
445 /* Extract flow from 'skb' into 'key'. */
446 error = ovs_flow_key_extract(tun_info, skb, &key);
447 if (unlikely(error)) {
448 kfree_skb(skb);
449 return error;
450 }
451 ovs_dp_process_packet(skb, &key);
452 return 0;
453}
454
455static int packet_length(const struct sk_buff *skb,
456 struct net_device *dev)
457{
458 int length = skb->len - dev->hard_header_len;
459
460 if (!skb_vlan_tag_present(skb) &&
461 eth_type_vlan(skb->protocol))
462 length -= VLAN_HLEN;
463
464 /* Don't subtract for multiple VLAN tags. Most (all?) drivers allow
465 * (ETH_LEN + VLAN_HLEN) in addition to the mtu value, but almost none
466 * account for 802.1ad. e.g. is_skb_forwardable().
467 */
468
469 return length > 0 ? length : 0;
470}
471
472void ovs_vport_send(struct vport *vport, struct sk_buff *skb, u8 mac_proto)
473{
474 int mtu = vport->dev->mtu;
475
476 switch (vport->dev->type) {
477 case ARPHRD_NONE:
478 if (mac_proto == MAC_PROTO_ETHERNET) {
479 skb_reset_network_header(skb);
480 skb_reset_mac_len(skb);
481 skb->protocol = htons(ETH_P_TEB);
482 } else if (mac_proto != MAC_PROTO_NONE) {
483 WARN_ON_ONCE(1);
484 goto drop;
485 }
486 break;
487 case ARPHRD_ETHER:
488 if (mac_proto != MAC_PROTO_ETHERNET)
489 goto drop;
490 break;
491 default:
492 goto drop;
493 }
494
495 if (unlikely(packet_length(skb, vport->dev) > mtu &&
496 !skb_is_gso(skb))) {
497 net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
498 vport->dev->name,
499 packet_length(skb, vport->dev), mtu);
500 vport->dev->stats.tx_errors++;
501 goto drop;
502 }
503
504 skb->dev = vport->dev;
505 vport->ops->send(skb);
506 return;
507
508drop:
509 kfree_skb(skb);
510}